[LLVMdev] How to figure out what #includes are needed?

[Rodney M. Bates]

This is partly an llvm question, and maybe partly C++.

I am trying to make calls on code in the llvm infrastructure.(3.4.2)  I appear
to be missing some include files, but don't know how to track them down.  I get
compile errors on existing llvm header files, like the following two examples:
--------------------------------------------------------------------------------

In file included from LLVMDIBuilder.cpp:16:
In file included from /usr/local/include/llvm/Support/CBindingWrapping.h:17:
In file included from /usr/local/include/llvm/Support/Casting.h:18:
In file included from /usr/local/include/llvm/Support/type_traits.h:22:
In file included from /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/utility:70:
In file included from /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/stl_pair.h:59:
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/move.h:185:5: error: conflicting types for 'swap'
     swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
     ^
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/move.h:166:5: note: previous definition is here
     swap(_Tp& __a, _Tp& __b)

--------------------------------------------------------------------------------
In file included from LLVMDIBuilder.cpp:16:
In file included from /usr/local/include/llvm/Support/CBindingWrapping.h:17:
In file included from /usr/local/include/llvm/Support/Casting.h:18:
/usr/local/include/llvm/Support/type_traits.h:48:33: error: functions that differ only in their return type cannot be overloaded
     template<typename T> double is_class_helper(...);
                                 ^
/usr/local/include/llvm/Support/type_traits.h:47:31: note: previous declaration is here
     template<typename T> char is_class_helper(void(T::*)());
                               ^
--------------------------------------------------------------------------------

Obviously, these files compile when included by the normal llvm build
process.  I have gotten many previous similar errors to go away by rote copying
in of all the #include lines in the full code listing in the new Kaleidoscope
Chapter 8 example and all those in core.cpp, but many more remain.

I would have expected missing declarations from missing include files to
give error messages like "undeclared identifier", but the effect seems to
be to make types that look different be the same, and vice versa (but
apparently not different enough to be legal overloads?).

My command line is:

clang++ -g LLVMDIBuilder.cpp `llvm-config --cxxflags --libs all`

$lvm-config --cxxflags --libs all
-I/usr/local/include  -D_DEBUG -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -g -fvisibility-inlines-hidden -fno-exceptions -fno-rtti -fPIC -Woverloaded-virtual -Wcast-qual
-lLLVMInstrumentation -lLLVMIRReader -lLLVMAsmParser -lLLVMDebugInfo -lLLVMOption -lLLVMLTO -lLLVMLinker -lLLVMipo -lLLVMVectorize -lLLVMBitWriter -lLLVMBitReader -lLLVMTableGen -lLLVMR600CodeGen -lLLVMR600Desc -lLLVMR600Info -lLLVMR600AsmPrinter -lLLVMSystemZDisassembler -lLLVMSystemZCodeGen -lLLVMSystemZAsmParser -lLLVMSystemZDesc -lLLVMSystemZInfo -lLLVMSystemZAsmPrinter -lLLVMHexagonCodeGen -lLLVMHexagonAsmPrinter -lLLVMHexagonDesc -lLLVMHexagonInfo -lLLVMNVPTXCodeGen -lLLVMNVPTXDesc -lLLVMNVPTXInfo -lLLVMNVPTXAsmPrinter -lLLVMCppBackendCodeGen -lLLVMCppBackendInfo -lLLVMMSP430CodeGen -lLLVMMSP430Desc -lLLVMMSP430Info -lLLVMMSP430AsmPrinter -lLLVMXCoreDisassembler -lLLVMXCoreCodeGen -lLLVMXCoreDesc -lLLVMXCoreInfo -lLLVMXCoreAsmPrinter -lLLVMMipsDisassembler -lLLVMMipsCodeGen -lLLVMMipsAsmParser -lLLVMMipsDesc -lLLVMMipsInfo -lLLVMMipsAsmPrinter -lLLVMARMDisassembler -lLLVMARMCodeGen -lLLVMARMAsmParser -lLLVMARMDesc -lLLVMARMInfo -lLLVMARMAsmPrinter -lLLVMAArch64Disassembler -lLLV
MAArch64CodeGen -lLLVMAArch64AsmParser -lLLVMAArch64Desc -lLLVMAArch64Info -lLLVMAArch64AsmPrinter -lLLVMAArch64Utils -lLLVMPowerPCCodeGen -lLLVMPowerPCAsmParser -lLLVMPowerPCDesc -lLLVMPowerPCInfo -lLLVMPowerPCAsmPrinter -lLLVMSparcCodeGen -lLLVMSparcDesc -lLLVMSparcInfo -lLLVMX86Disassembler -lLLVMX86AsmParser -lLLVMX86CodeGen -lLLVMSelectionDAG -lLLVMAsmPrinter -lLLVMX86Desc -lLLVMX86Info -lLLVMX86AsmPrinter -lLLVMX86Utils -lLLVMMCDisassembler -lLLVMMCParser -lLLVMInterpreter -lLLVMMCJIT -lLLVMJIT -lLLVMCodeGen -lLLVMObjCARCOpts -lLLVMScalarOpts -lLLVMInstCombine -lLLVMTransformUtils -lLLVMipa -lLLVMAnalysis -lLLVMRuntimeDyld -lLLVMExecutionEngine -lLLVMTarget -lLLVMMC -lLLVMObject -lLLVMCore -lLLVMSupport

How do I figure out what to include to fix these?



-- 
Rodney Bates
rodney.m.bates at acm.org